Used as a photoinitiator in UV-curable systems, enabling rapid polymerization of inks, coatings, and adhesives upon exposure to ultraviolet light. Its strong absorption in the long-wavelength UV region makes it effective in thick or pigmented formulations where deeper light penetration is required. Commonly applied in printing inks, electronic coatings, and dental materials due to its efficiency and low yellowing tendency. Also serves as a stabilizer in some polymer systems to prevent degradation under sunlight.